thomson



May 22, 1923.

Re. l15,609 E. E. THOMSON IJAGK Original' Fil-.ed Dec. 1,

1919 2 Sheets Sheet 1 Li//A n H M l INVENTR.

-Enmfomdara BY;

ATTORN YA' Re. 15,609"l E. E. THOMSON May 22, 1923;

JACK

2 Sheets-Sheet 2 Original F1164 Dec. l

INVENTOR.

Arrows/Ew1 Ressuel May 22, 1923.

Re. 15,609A

PAAT-ENT OFFICE.

Enos E. THOMSON, or CLEVELAND, omo.

Juelz;

Uriginal llo. 1,859,849, dated- November 23, 1920, Serial No. 341,773, led December 1, 1919. Application for reissue illed J'uly 15, 1921.

To allwhom' 'it may concer/i: I I

Be it known that I, ENOS E. THOMSON, a

` fcitizen of the United States, and a resident of Cleveland, coimty of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Jacks, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions. i

This invention relates to jacks, and comprehends a construction, by means of which a load may be lifted twice as high and twice as fast as"with an ordinaryjack, and with the expenditure of a minimum of energy.

The nature and advantages of the invention will be better understood when the following detail description is taken in connection with the accompanying drawings,l

the invention residing in the construction, combination and arrangement of parts as claimed. l

In the drawings forming part of this specification, like numerals of reference indicate similar parts in the several views and wherein 2- Figure 1 is a side elevation of the jack constructed in accordance with' my invention; Figure 2 is a transverse sectional view taken on the line 2-2 ofFigure 1; Figure 3 is a top plan view; Figure 4 isa transverse f sectional view taken on the line 4 4 of Figure 1; Figure 5 is a vertical sectional view taken through the jack. j

The jack constructed in accordance with `my invention comprises a' base 10,`from which rises a plurality of hollow tubular standards. These standards include a central standard 11 whose diameter greatly exceeds the diameter of the standards 12. The

standard 11 is interiorly threaded to accommodate an exteriorly threaded sleeve 13 which is provided with a bevel gear 14 at the upper end thereof. The lifting screw 15 is slidable through the sleeve and has a relatively large end portion 16. This screw is supported by means of the transverse member 17 ofa frame which includes parallel depending rods 18 which are telescopi'cally fitted within the tubular members 19, which latter are slidably fitted within the tubular members 12. A bevel gear 2O oppositely disposed with regard to the bevel gear 14 Seri'al N0. 485,042.

is threadedly associated with the screw 15l for the purpose to be hereinafter described.

A plate of substantially U-shaped formation in plan is indicated at 21 and is terminally connected with the tubularmembers 19. This plate constitutes a bearing for the shaft 22 upon which is fixed the pinion or thegears 14 and 20respectively to operate these gears. The shaft 22 is of the extension crank typev embodying universal joints 24 so that the user of the jack may stand in an upright positionwhile raisingv or lower- ,ing the jack as ythe occasion may require. 'The tubular standards 11 and 12 respectively are connected at their upper ends by means of the plate 25 which serves to brace t-he construction, and also serves as a seat for the bevel gear 14 of the hollow sleeve 13. y.i In practice, the crank extension 26 ot lbevel gear 23 which is positioned between as fast as the speed with which the sleeve 13 is elevated. It is therefore obvious that the jack will elevate a load twice the distance and twice Vas fast as the jack of ordinary construction and that the construction and arrangement is such that all ratchets and catchesare eliminated. When the jack is not iniu-se, the crank extension can be folded against the jack so as to provide an article which can be conveniently carried in a `tool box or the like.r The tubular members 19 and the rods 18 telescope one within the other, while the membersl) telescope within the standards 12 when the jack is being raised or lowered as will .be understood.

While it is believed that from the fore-v lgoing description that thevnature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself in this connection, in p an object-engaging terminal upon each' of teriorly threaded, an exteriorly, threaded sleeve operable within said standard, a bevel gear securedr to the upper end of said sleeve, a lifting screw slidable through said sleeve,

'a bevel rgear having threaded association with said screw, means for rotating said gears in reverse direction whereby the sleeve' is elevated wit/hin the standard and the screw lifted with respect .to said sleeve, and

means for supporting said screw.

' 2.- Ajack comprising a base, a hollow tubulai' standard rising therefrom and interiorly threaded, spaced hollow standards rising from said base, an eXteriorly threaded sleeve operable within said threaded standard, and a bevel gear carried by the upper end of said sleeve, alifting screw slidable thriigh said sleeve, a bevel gear theadedly associated within said screw, ,a frame supporting said screw, and including parallel members slidably fitted ,within said spaced 'tubular standards, and m'e'ans forwrotating;

said gearsin a "reverse direction!whereby the sleeve is rotated 'to elevate the screw-with relation to the sleeve.; V

8. A jack comprising'abasefan enlarged tubular standard rising therefromI and in teriorly threaded,l spaced hollow tubular standards rising from the ,base at' opposite sides of the enlarged standard, a sleeve exteriorly threaded and operable within the enlarged standards, and a bevel gear carried by the upper end of saidv sleeve, a bevel gear having threaded association'with said lifting screw, hollow tubular members telescopically fitted within the standards at the opposite sides of the enlarged standard, a

- plate connecting said 'tubular member, said plate constituting a bearing, a shaft journaled in said bearing, a bevel'gear carried by the shaft and arrangedV to operate the aforementioned gears Ain reverse direction,

whereby the sleeve is elevated within the tubular member upon rotation, and the lifting screw elevated withirespect to the sleeve, a frame supporting said screw, and said frame including parallel rods telescopically litted within said tubular member.

et, In a device of the characterdescribed,v

the combination of two'screw members, one interiorly and the. other exteriorly threaded;

said members; two 1elatively`rotatable members having threaded engagement with said'v Y screw-members, respectively and means adapted simultaneously to turn said rotatable members in opposite direction, whereby the distance between sa d objectengaging terminals'will be changed.

'5. In a device of the character described, the combination of a baserprivided with an interiorly threaded screwnQie-mber; an eX.- teriorly threaded screjwmember adapted to engage the object to be lifted: two'relatively `rotatable members havingrthreaded engage,

ment with said screw-members, respectively and means adapted simultaneously' to turn said rotatable "members inopposite directions, whereby said objectnengagingmember will be moved relatively to said base.

6. In a device of the character described,"

the combination oftwo screw-members, one intericrly and the other eXteriorly threaded; an object-engaging terminal upon each of said members; two relatively rotatable members having threaded engagement with said screw-members, respectively; gears/fixed on Asaid rotatable members, respectively; and

meansl adapted simultaneously to drive said gears in opposite directionswhereby the `distance between said object-engaging 'terminals will be changed.

7. In a device of the ,character describe-d,y

the combination of two screw-members, one i'nteriorlyand the other eXteriorly threaded;

j an objectsengaging terminal upon each y"of said members; two relatively rotatable members having threaded engagement with said screw-members, respectively; gears ixed on Vsaid rotatable members, respectively; a frame reciprocally movable relatively tb said intariorly threaded screw-membergt. and means carried by said frame adapted simultaneously to drive said gearsin/ opposite direactions, whereby thedistance between said pbject-engaging terminals willI be changed.

8. In a device of the character described.' the combination of two. screwfmembers, one

iuteriorlyand the other eXte'riorly threaded;

l. an object-engaging terminal upon eac-h of the combination of two screw-members, one

interiorly, andthe other eXteriorly threaded an object-engaging terminal upon each of said members; two relatively rotatable mem'- bers having threaded vengagement with said screw-members, respectively, the rotatable memberthatfengages said erteriorly thread? ed screw-member being rotatably supported on the other rotate/ble member; a frame re ciprocably but' nonerotatably movablel relatively to said interiorly threaded screwmember; and meanscarried by said frame adapted simliltaiieouslyftovdrive Vsaid gears in oppositedirectiens, whereby lthe Y distance between` said' object-engaging terminals will be changed. i j

Signed by me, this 8th day of Jul 1921.

v ENOS E. THOM ON. 

